# Hazard Identification Charts **Citation:** ERG 2024, Hazard Identification Charts **Type / status:** guidance / guidance **Agency:** U.S. DOT / Transport Canada / SICT **Effective:** Not stated **Published:** 2024-04-04 Official ERG2024 hazard identification charts guidance, pages 9-23. ## Document text INTRODUCTION TO THE TABLE OF MARKINGS, LABELS AND PLACARDS USE THIS TABLE ONLY WHEN THE ID NUMBER OR PROPER SHIPPING NAME IS NOT AVAILABLE. This section displays the placards used on transport vehicles carrying hazardous materials/ dangerous goods with the applicable reference GUIDE circled. Follow these steps: 1. Approach scene from upwind, uphill and/or upstream at a safe distance to safely identify and/or read the placard or orange panel. Use binoculars if available. 2. 3. Match the vehicle placard(s) with one of the placards displayed in this section. Consult the circled guide number associated with the placard. Use that guide information for now. For example: • Use GUIDE 127 for a FLAMMABLE (Class 3) placard 4. 5. 6. 7. • Use GUIDE 153 for a CORROSIVE (Class 8) placard • Use GUIDE 111 when the DANGER or DANGEROUS placard is displayed or the nature of the spilled, leaking or burning material is not known. Also use this GUIDE when the presence of hazardous materials/dangerous goods is suspected but no placards can be seen. If multiple placards point to more than one guide, initially use the most conservative guide (i.e., the guide requiring the greatest degree of protective actions). Guides associated with the placards provide the most significant risk and/or hazard information. When specific information, such as ID number or proper shipping name, becomes available, the more specific Guide recommended for that material must be consulted. A single asterisk (*) on orange placards represents an explosive's compatibility group letter. The asterisk must be replaced with the appropriate compatibility group letter. Refer to the “Glossary” section. Double asterisks (**) on orange placards represent the division of the explosive. The double asterisks must be replaced with the appropriate division number. Page 7 TABLE OF MARKINGS, LABELS AND PLACARDS USE THIS TABLE ONLY IF MATERIALS CANNOT BE SPECIFICALLY IDENTIFIED BY DANGER 111 DANGEROUS 112 1.5 EXPLOSIVES 1.2, 1.3 and 1.5, enter For Divisions 1.1, BLASTING .5 division number (**) and AGENTS modes compatibility group letter (*), when required. 1.4 114 118 1.6 EXPLOSIVES, EXPLOSIVES For Divisions 1.4 and 1.6, enter 1.6 FLAMMABLE compatibility group GAS letter (*), when required. 123 20 122 INHALATION HAZARD NON-FLAMMABLE GAS OXYGEN INHALATION HAZARD 127 128 125 HOT COMBUSTIBLE FUEL OIL GASOLINE FLAMMABLE 1005 Page 8 S Y AND INITIAL RESPONSE GUIDE TO USE ON-SCENE AND INITIAL RESPONSE GUIDE TO USE ON-SCENE AND INITIAL RESPONSE GUIDE TO USE ON-SCENE AND INITIAL RESPONSE GUIDE TO USE ON-SCENE AND INITIAL RESPONSE GUIDE TO USE ON-SCENE AND INITIAL RESPONSE GUIDE TO USE ON-SCENE AND INITIAL RESPONSE GUIDE TO USE ON-SCENE AND INITIAL RESPONSE GUIDE TO USE ON-SCENE AND INITIAL RESPONSE GUIDE TO USE ON-SCENE AND INITIAL RESPONSE GUIDE TO USE ON-SCENE AND INITIAL RESPONSE GUIDE TO USE ON-SCENE AND INITIAL RESPONSE GUIDE TO USE ON-SCENE USING THE SHIPPING PAPER, NUMBERED PLACARD, OR ORANGE PANEL NUMBER USING THE SHIPPING PAPER, NUMBERED PLACARD, OR ORANGE PANEL NUMBER USING THE SHIPPING PAPER, NUMBERED PLACARD, OR ORANGE PANEL NUMBER USING THE SHIPPING PAPER, NUMBERED PLACARD, OR ORANGE PANEL NUMBER USING THE SHIPPING PAPER, NUMBERED PLACARD, OR ORANGE PANEL NUMBER USING THE SHIPPING PAPER, NUMBERED PLACARD, OR ORANGE PANEL NUMBER USING THE SHIPPING PAPER, NUMBERED PLACARD, OR ORANGE PANEL NUMBER USING THE SHIPPING PAPER, NUMBERED PLACARD, OR ORANGE PANEL NUMBER USING THE SHIPPING PAPER, NUMBERED PLACARD, OR ORANGE PANEL NUMBER USING THE SHIPPING PAPER, NUMBERED PLACARD, OR ORANGE PANEL NUMBER USING THE SHIPPING PAPER, NUMBERED PLACARD, OR ORANGE PANEL NUMBER USING THE SHIPPING PAPER, NUMBERED PLACARD, OR ORANGE PANEL NUMBER 134 134 134 134 134 134 134 134 134 134 134 134 134 134 134 134 134 134 134 134 134 134 136 136 136 136 136 136 136 136 136 136 136 136 136 136 136 136 136 136 136 136 136 136 139 139 139 139 139 139 139 139 139 139 139 139 139 139 139 139 139 139 139 139 139 139 143 143 143 143 143 143 143 143 143 143 143 143 143 143 143 143 143 143 143 143 143 143 148 148 148 148 148 148 148 148 148 148 148 148 148 148 148 148 148 148 148 148 148 148 153 153 153 153 153 153 153 153 153 153 153 153 153 153 153 153 153 153 153 153 153 153 158 158 158 158 158 158 158 158 158 158 158 158 158 158 158 158 158 158 158 158 158 158 163 163 163 163 163 163 163 163 163 163 163 163 163 163 163 163 163 163 163 163 163 163 153 153 153 153 153 153 153 153 153 153 153 153 153 153 153 153 153 153 153 153 153 153 138 138 138 138 138 138 138 138 138 138 138 138 138 138 138 138 138 138 138 138 138 138 Lithium metal batteries Lithium metal batteries Lithium metal batteries Lithium metal batteries Lithium metal batteries Lithium metal batteries Lithium metal batteries Lithium metal batteries Lithium metal batteries Lithium metal batteries Lithium metal batteries Lithium metal batteries Lithium metal batteries Lithium metal batteries Lithium metal batteries Lithium metal batteries Lithium metal batteries Lithium metal batteries Lithium metal batteries Lithium metal batteries Lithium metal batteries Lithium metal batteries (UN3090, UN3091) (UN3090, UN3091) (UN3090, UN3091) (UN3090, UN3091) (UN3090, UN3091) (UN3090, UN3091) (UN3090, UN3091) (UN3090, UN3091) (UN3090, UN3091) (UN3090, UN3091) (UN3090, UN3091) (UN3090, UN3091) (UN3090, UN3091) (UN3090, UN3091) (UN3090, UN3091) (UN3090, UN3091) (UN3090, UN3091) (UN3090, UN3091) (UN3090, UN3091) (UN3090, UN3091) (UN3090, UN3091) (UN3090, UN3091) Lithium ion batteries Lithium ion batteries Lithium ion batteries Lithium ion batteries Lithium ion batteries Lithium ion batteries Lithium ion batteries Lithium ion batteries Lithium ion batteries Lithium ion batteries Lithium ion batteries Lithium ion batteries Lithium ion batteries Lithium ion batteries Lithium ion batteries Lithium ion batteries Lithium ion batteries Lithium ion batteries Lithium ion batteries Lithium ion batteries 147 147 147 147 147 147 147 147 147 147 147 147 147 147 147 147 147 147 147 147 147 147 Lithium ion batteries Lithium ion batteries (UN3480, UN3481) (UN3480, UN3481) (UN3480, UN3481) (UN3480, UN3481) (UN3480, UN3481) (UN3480, UN3481) (UN3480, UN3481) (UN3480, UN3481) (UN3480, UN3481) (UN3480, UN3481) (UN3480, UN3481) (UN3480, UN3481) (UN3480, UN3481) (UN3480, UN3481) (UN3480, UN3481) (UN3480, UN3481) (UN3480, UN3481) (UN3480, UN3481) (UN3480, UN3481) (UN3480, UN3481) (UN3480, UN3481) (UN3480, UN3481) 171 171 171 171 171 171 171 171 171 171 171 171 171 171 171 171 171 171 171 171 171 171 Page 9 RAIL CAR IDENTIFICATION CHART CAUTION: Emergency response personnel must be aware that rail tank cars vary widely in construction, fittings and purpose. Tank cars could transport products that may be solids, liquids or gases. The products may be under pressure. It is essential that products be identified by consulting shipping papers or train consist or contacting dispatch centers before emergency response is initiated. The information stenciled on the sides or ends of tank cars, as illustrated below, may be used to identify the product utilizing: a. the commodity name shown; b. the other information shown, especially reporting marks and car number which, when supplied to a dispatch center, will facilitate the identification of the product. The recommended guides should be considered as last resort if the material cannot be identified by any other means. 117 Pressure tank car • • • • For flammable, non-flammable, toxic and/or liquefied compressed gases Protective housing No bottom fittings Pressures usually above 40 psi 131 Non-pressure / low pressure tank car • • • • • Known as general service tank car For variety of hazardous and non-hazardous materials Fittings and valves normally visible at the top of the tank Some may have bottom outlet valve Pressures usually below 25 psi Page 10 RAIL CAR IDENTIFICATION CHART 128 Non-pressure / low pressure tank car (TC117, DOT117) • • • • For flammable liquids (e.g., petroleum crude oil, ethanol) Protective housing separate from manway Bottom outlet valve Pressures usually below 25 psi 115 Cryogenic tank car • • • For refrigerated liquefied gases (cryogenic liquids) Vacuum-insulated railcars (tank within a tank) Fittings compartment located in a cabinet at ground level of the tank • Pressures range from 10 - 75 psi Page 11 RAIL CAR IDENTIFICATION CHART 111 Box car • • • For general freight that carry bulk or non-bulk packages May transport hazardous materials/dangerous goods in small packages or "totes" Single or double sliding door 140 Hopper car • • For bulk commodities and bulk cargo (e.g., coal, ore, cement and solid granular materials) Bulk lading discharged by gravity through the hopper bottom doors when doors opened COMMON MARKINGS ON RAIL CARS: reporting marks and car number, load limit (pounds or kilograms), empty weight of car, placard, tank qualification and pressure relief device information, car specification, and commodity name. Page 12 ROAD TRAILER IDENTIFICATION CHART CAUTION: This chart depicts only the most general shapes of road trailers and cargo transport units. Emergency response personnel must be aware that there are many variations of road trailers, not illustrated below, that are used for shipping chemical products. Many intermodal tanks that transport liquids, solids, liquefied compressed gases, and refrigerated liquefied gases have similar silhouettes. The suggested guides are for the most hazardous products that may be transported in these trailer types. WARNING : Road trailers may be jacketed, the cross-section may look different than shown and external ring stiffeners would be invisible. NOTE: An emergency shut-off valve is commonly found at the front of the tank, near the driver door. The recommended guides should be considered as last resort if the material cannot be identified by any other means. MAWP: Maximum Allowable Working Pressure. 117 MC331, TC331, SCT331 • • • • For liquefied compressed gases (e.g., LPG, ammonia) Rounded heads Design pressure between 100-500 psi Different configurations exist 117 MC338, TC338, SCT338, TC341, CGA341 • • • • For refrigerated liquefied gases (cryogenic liquids) Similar to a "giant thermo-bottle" Fittings compartment located in a cabinet at the rear of the tank MAWP between 25-500 psi 137 DOT407, TC407, SCT307, MC307, TC307 • • • • For toxic, corrosive, and flammable liquids Circular cross-section May have external ring stiffeners MAWP of at least 25 psi Page 13 ROAD TRAILER IDENTIFICATION CHART 131 DOT406, TC406, SCT306/406, MC306, TC306 • • • • • • For flammable liquids (e.g., gasoline, diesel) Elliptical cross-section Rollover protection at the top Bottom outlet valves MAWP between 3-5 psi (US + Mexico: MC306, DOT406, SCT306/406) MAWP between 3-15 psi (Canada: TC306/406) 137 DOT412, TC412, SCT312, MC312, TC312 • • • • • Usually for corrosive liquids Circular cross-section External ring stiffeners Tank diameter is relatively small MAWP of at least 15 psi 112 TC423 • • • For emulsion and water-gel explosives Hopper-style configuration MAWP between 5-15 psi 117 Compressed Gas/Tube Trailer • • • For pressurized gases (e.g., air, helium, oxygen) Long horizontal tubes permanently mounted on a trailer Filling and discharge manifold typically located at the rear of trailer Page 14 ROAD TRAILER IDENTIFICATION CHART 134 Dry Bulk Cargo Trailer • • • For dry bulk cargo (e.g., oxidizers, corrosive solids, cement, plastic pellets, fertilizers) Also known as hopper tanks or hopper trailers Shape can vary but always contains one or more cone shaped bins 137 Vacuum Tanker • • For cleanup of chemical/oil spills or for hauling crude oil, water Large hinged rear door used for dumping 111 Mixed Cargo • • 111 Intermodal Freight Container • For general freight that carry bulk or non-bulk packages May transport hazardous materials/ dangerous goods in small packages (e.g., bags, boxes, drums) or intermediate bulk containers (IBCs), sometimes referred to as “totes" Cargo door(s) in the rear 117 Intermodal Tank • • • For liquefied compressed gases, refrigerated liquefied gases, solids and liquids Working pressure may range from 20 to 500 psi Tank capacity can range from 50 to 12,000 gallons (200 to 45,000 L), and tank dimensions may vary Page 15 GLOBALLY HARMONIZED SYSTEM OF CLASSIFICATION AND LABELING OF CHEMICALS (GHS) (May be found on means of containment during transport) The Globally Harmonized System of Classification and Labeling of Chemicals (GHS) is an international guideline published by the United Nations. The GHS aims to harmonize the classification and labeling systems for all sectors involved in the life cycle of a chemical (production, storage, transport, workplace use, consumer use and presence in the environment). The GHS has nine symbols used to convey specific physical, health and environmental hazard information. These symbols are part of a pictogram that is diamond shaped and includes the GHS symbol in black on a white background with a red frame. The pictogram is part of the GHS label, which also includes the following information: • • • • • Signal word Hazard statement Precautionary statements Product identifier Supplier identification GHS pictograms are similar in shape to transport labels; however, transport labels have backgrounds of different colors. The elements of the GHS that address signal words and hazard statements are not expected to be adopted in the transport sector. For substances and mixtures covered by the UN Recommendations on the Transport of Dangerous Goods, Model Regulations, the transport labels for physical hazards will have precedence. In transport, a GHS pictogram for the same (or lesser) hazard as the one reflected by the transport label or placard should not be present, but it could exist on the package. Examples of GHS labeling: Outer Packaging: Box with flammable liquid transport label Inner Packaging: Plastic Single Packaging: 200 L bottle with GHS hazard warning label (55 US gallons) drum with a flammable liquid transport label combined with GHS hazard warning label Page 16 In some cases, such as on drums or intermediate bulk containers (IBCs), which must address information for all sectors, the GHS label may be found in addition to the required transport labels and placards. Both types of labels (GHS and transport) will differ in a way that will make them easy to identify during an emergency. GHS Pictograms Physical hazards Pictograms GHS Health and Environmental hazards Explosive; Self-reactive; Organic peroxide Skin corrosion; Serious eye damage Flammable; Pyrophoric; Self-reactive; Organic peroxide; Self-heating; Emits flammable gases when in contact with water Acute toxicity (harmful); Skin sensitizer; Irritant (skin and eye); Narcotic effect; Respiratory tract irritant; Hazardous to ozone layer (environment) Oxidizer Respiratory sensitizer; Mutagen; Carcinogen; Reproductive toxicity; Target organ toxicity; Aspiration hazard Gas under pressure Hazardous to aquatic environment Corrosive to metals Acute toxicity (fatal or toxic) Page 17 HAZARD IDENTIFICATION NUMBERS DISPLAYED ON SOME INTERMODAL CONTAINERS Hazard identification numbers, utilized under European and some South American regulations, may be found in the top half of an orange panel on some intermodal bulk containers. The 4-digit ID number is in the bottom half of the orange panel. The hazard identification number in the top half of the orange panel consists of two or three digits. In general, the digits indicate the following hazards: 2 - Emission of gas due to pressure or to chemical reaction 3 - Flammability of liquids (vapors) and gases or self-heating liquid 4 - Flammability of solids or self-heating solid 5 - Oxidizing (fire-intensifying) effect 6 - Toxicity or risk of infection 7 - Radioactivity 8 - Corrosivity 9 - Risk of spontaneous violent reaction NOTE: The risk of spontaneous violent reaction within the meaning of digit 9 includes the possibility, due to the nature of a substance, of a risk of explosion, disintegration and polymerization reaction followed by the release of considerable heat or flammable and/or toxic gases. • Doubling of a digit indicates an intensification of that particular hazard (e.g., 33, • • • 66, 88). Where the hazard associated with a substance can be adequately indicated by a single digit, the digit is followed by a zero (e.g., 30, 40, 50). A hazard identification number prefixed by the letter “X” indicates that the substance will react dangerously with water (e.g., X88). For the transport of Class 1 materials, the hazard identification number will be replaced by the explosive’s division number and compatibility group. Page 18 HAZARD IDENTIFICATION NUMBERS DISPLAYED ON SOME INTERMODAL CONTAINERS The hazard identification numbers listed below have the following meanings: 20 Asphyxiant gas or gas with no subsidiary hazard 22 Refrigerated liquefied gas, asphyxiant 223 Refrigerated liquefied gas, flammable 225 Refrigerated liquefied gas, oxidizing (fire-intensifying) 23 Flammable gas 238 Gas, flammable corrosive 239 Flammable gas which can spontaneously lead to violent reaction 25 Oxidizing (fire-intensifying) gas 26 Toxic gas 263 Toxic gas, flammable 265 Toxic gas, oxidizing (fire-intensifying) 268 Toxic gas, corrosive 28 Gas, corrosive 30 Flammable liquid (flash-point between 23°C and 60°C, inclusive), or flammable liquid or solid in the molten state with a flash-point above 60°C, heated to a temperature equal to or above its flash-point, or self-heating liquid 323 Flammable liquid which reacts with water, emitting flammable gases X323 Flammable liquid which reacts dangerously with water, emitting flammable gases 33 Highly flammable liquid (flash-point below 23°C) 333 Pyrophoric liquid X333 Pyrophoric liquid which reacts dangerously with water 336 Highly flammable liquid, toxic 338 Highly flammable liquid, corrosive X338 Highly flammable liquid, corrosive, which reacts dangerously with water 339 Highly flammable liquid which can spontaneously lead to violent reaction 36 Flammable liquid (flash-point between 23°C and 60°C, inclusive), slightly toxic, or self-heating liquid, toxic 362 Flammable liquid, toxic, which reacts with water, emitting flammable gases X362 Flammable liquid, toxic, which reacts dangerously with water, emitting flammable gases 368 Flammable liquid, toxic, corrosive 38 Flammable liquid (flash-point between 23°C and 60°C, inclusive), slightly corrosive or self-heating liquid, corrosive 382 Flammable liquid, corrosive, which reacts with water, emitting flammable gases X382 Flammable liquid, corrosive, which reacts dangerously with water, emitting flammable gases 39 Flammable liquid, which can spontaneously lead to violent reaction 40 Flammable solid, or self-reactive substance, or self-heating substance, or polymerizing substance Page 19 HAZARD IDENTIFICATION NUMBERS DISPLAYED ON SOME INTERMODAL CONTAINERS 423 Solid which reacts with water, emitting flammable gases, or flammable solid which reacts with water, emitting flammable gases, or self-heating solid which reacts with water, emitting flammable gases X423 Solid which reacts dangerously with water, emitting flammable gases, or flammable solid which reacts dangerously with water, emitting flammable gases, or self-heating solid which reacts dangerously with water, emitting flammable gases 43 Spontaneously flammable (pyrophoric) solid X432 Spontaneously flammable (pyrophoric) solid which reacts dangerously with water, emitting flammable gases 44 Flammable solid, in the molten state at an elevated temperature 446 Flammable solid, toxic, in the molten state at an elevated temperature 46 Flammable or self-heating solid, toxic 462 Toxic solid which reacts with water, emitting flammable gases X462 Solid which reacts dangerously with water, emitting toxic gases 48 Flammable or self-heating solid, corrosive 482 Corrosive solid which reacts with water, emitting flammable gases X482 Solid which reacts dangerously with water, emitting corrosive gases 50 Oxidizing (fire-intensifying) substance 539 Flammable organic peroxide 55 Strongly oxidizing (fire-intensifying) substance 556 Strongly oxidizing (fire-intensifying) substance, toxic 558 Strongly oxidizing (fire-intensifying) substance, corrosive 559 Strongly oxidizing (fire-intensifying) substance which can spontaneously lead to violent reaction 56 Oxidizing substance (fire-intensifying), toxic 568 Oxidizing substance (fire-intensifying), toxic, corrosive 58 Oxidizing substance (fire-intensifying), corrosive 59 Oxidizing substance (fire-intensifying) which can spontaneously lead to violent reaction 60 Toxic or slightly toxic substance 606 Infectious substance 623 Toxic liquid, which reacts with water, emitting flammable gases 63 Toxic substance, flammable (flash-point between 23°C and 60°C, inclusive) 638 Toxic substance, flammable (flash-point between 23°C and 60°C, inclusive), corrosive 639 Toxic substance, flammable (flash-point not above 60°C) which can spontaneously lead to violent reaction 64 Toxic solid, flammable or self-heating 642 Toxic solid which reacts with water, emitting flammable gases 65 Toxic substance, oxidizing (fire-intensifying) 66 Highly toxic substance 663 Highly toxic substance, flammable (flash-point not above 60°C) Page 20 HAZARD IDENTIFICATION NUMBERS DISPLAYED ON SOME INTERMODAL CONTAINERS 664 Highly toxic solid, flammable or self-heating 665 Highly toxic substance, oxidizing (fire-intensifying) 668 Highly toxic substance, corrosive X668 Highly toxic substance, corrosive, which reacts dangerously with water 669 Highly toxic substance which can spontaneously lead to violent reaction 68 Toxic substance, corrosive 69 Toxic or slightly toxic substance which can spontaneously lead to violent reaction 70 Radioactive material 768 Radioactive material, toxic, corrosive 78 Radioactive material, corrosive 80 Corrosive or slightly corrosive substance X80 Corrosive or slightly corrosive substance which reacts dangerously with water 823 Corrosive liquid which reacts with water, emitting flammable gases 83 Corrosive or slightly corrosive substance, flammable (flash-point between 23°C and 60°C, inclusive) X83 Corrosive or slightly corrosive substance, flammable (flash-point between 23°C and 60°C, inclusive), which reacts dangerously with water 836 Corrosive or slightly corrosive substance, flammable (flash-point between 23°C and 60°C, inclusive) and toxic 839 Corrosive or slightly corrosive substance, flammable (flash-point between 23°C and 60°C, inclusive), which can spontaneously lead to violent reaction X839 Corrosive or slightly corrosive substance, flammable (flash-point between 23°C and 60°C, inclusive), which can spontaneously lead to violent reaction and which reacts dangerously with water 84 Corrosive solid, flammable or self-heating 842 Corrosive solid which reacts with water, emitting flammable gases 85 Corrosive or slightly corrosive substance, oxidizing (fire-intensifying) 856 Corrosive or slightly corrosive substance, oxidizing (fire-intensifying) and toxic 86 Corrosive or slightly corrosive substance, toxic 88 Highly corrosive substance X88 Highly corrosive substance which reacts dangerously with water 883 Highly corrosive substance, flammable (flash-point between 23°C and 60°C, inclusive) 884 Highly corrosive solid, flammable or self-heating 885 Highly corrosive substance, oxidizing (fire-intensifying) 886 Highly corrosive substance, toxic X886 Highly corrosive substance, toxic, which reacts dangerously with water 89 Corrosive or slightly corrosive substance which can spontaneously lead to violent reaction 90 Environmentally hazardous substance; miscellaneous dangerous substances 99 Miscellaneous dangerous substance carried at an elevated temperature Page 21 ## Provenance - Official: Yes - Source: - Source ID: `phmsa-erg-2024` - SHA-256: `e9afe7fa2de441dc6cae73675c061b7506d9836a42c703478e0f7c84cc2396d1` - Retrieved: 2026-08-13T11:31:32.574Z - Exported: 2026-08-22T20:10:01.793Z - Document slug: `phmsa-erg-2024-hazard-identification` ### Source metadata ```json { "edition": 2024, "language": "English", "jurisdiction": "US", "caveat": "Emergency-response guidance for the initial phase of a transportation incident. It is not controlling regulation, a compliance determination, a chemical-specific worker safety document, or a substitute for required shipping-paper emergency-response information.", "materialSubtype": "phmsa_erg_reference", "recordKind": "reference", "collectionId": "phmsa-erg-2024-overview", "parentDocumentId": "phmsa-erg-2024-overview", "sourceDateLabel": "Effective Date", "sourceDate": "2024-04-04", "startPage": 9, "endPage": 23, "physicalPageCount": 15 } ```